The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO
In this work, the origin of the synergetic effect in mixed Mn<sub>x</sub>Co<sub>3-x</sub>O<sub>4</sub> oxides with the spinel structure in the CO oxidation reaction was tested. A series of Mn<sub>x</sub>Co<sub>3-x</sub> oxide catalysts were...
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2024-12-01
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| author | Olga A. Bulavchenko Vladimir A. Rogov Evgeny Yu. Gerasimov Egor E. Aydakov Anna M. Kremneva |
| author_facet | Olga A. Bulavchenko Vladimir A. Rogov Evgeny Yu. Gerasimov Egor E. Aydakov Anna M. Kremneva |
| author_sort | Olga A. Bulavchenko |
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| description | In this work, the origin of the synergetic effect in mixed Mn<sub>x</sub>Co<sub>3-x</sub>O<sub>4</sub> oxides with the spinel structure in the CO oxidation reaction was tested. A series of Mn<sub>x</sub>Co<sub>3-x</sub> oxide catalysts were synthesized by the coprecipitation method with further calcination at 600 °C and varying manganese content from x = 0 to x = 3. The catalysts were characterized using XRD, TEM, N<sub>2</sub> adsorption, TPR, EXAFS, and XPS. The catalytic activity of Mn<sub>x</sub>Co<sub>3-x</sub> oxide catalysts was tested in CO oxidation reactions. The addition of manganese to cobalt oxide results in the formation of mixed Mn-Co oxides based on a cubic or tetragonal spinel structure, a change in microstructural properties, such as surface area and crystal size, as well as local distortions and a decrease in the surface concentration of Co ions and Co in the octahedral sites in spinel structure; it also decreases catalyst reducibility. For all catalysts, the activity of CO oxidation decreases as follows: Mn<sub>0.1</sub>Co<sub>2.9</sub> > Co<sub>3</sub>O<sub>4</sub>~Mn<sub>0.3</sub>Co<sub>2.7</sub> > Mn<sub>0.5</sub>Co<sub>2.5</sub> > MnO<sub>x</sub> > Mn<sub>0.7</sub>Co<sub>2.3</sub> > Mn<sub>0.9</sub>Co<sub>2.1</sub>~Mn<sub>1.1</sub>Co<sub>1.9</sub>~Mn<sub>2.5</sub>Co<sub>0.5</sub> > Mn<sub>2.9</sub>Co<sub>0.1</sub> > Mn<sub>1.7</sub>Co<sub>1.3</sub> > Mn<sub>2.1</sub>Co<sub>0.9</sub> > Mn<sub>1.3</sub>Co<sub>1.7</sub>~Mn<sub>1.5</sub>Co<sub>1.5</sub>~Mn<sub>2.3</sub>Co<sub>0.7</sub>. The Mn<sub>0.1</sub>Co<sub>2.9</sub> catalyst displays the best catalytic activity, which is attributed to its small crystal size and the maximum surface ratio between Co<sup>3+</sup> and Co<sup>2+</sup>. A further increase in the manganese content (x > 0.3) provokes drastic changes in the catalytic properties due to a decrease in the cobalt content on the surface and in the volume of mixed oxide, changes in the oxidation states of cations, and structure transformation. |
| format | Article |
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| spelling | doaj-art-3b17e68c8a9044fea03c79910f6c84c72025-01-24T13:35:28ZengMDPI AGInorganics2304-67402024-12-01131810.3390/inorganics13010008The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of COOlga A. Bulavchenko0Vladimir A. Rogov1Evgeny Yu. Gerasimov2Egor E. Aydakov3Anna M. Kremneva4Synchrotron Radiation Facility SKIF, Nikolsky Prosp., 1, 630559 Kol’tsovo, RussiaPhysical Department, Novosibirsk State University, Pirogova 2, 630090 Novosibirsk, RussiaPhysical Department, Novosibirsk State University, Pirogova 2, 630090 Novosibirsk, RussiaSynchrotron Radiation Facility SKIF, Nikolsky Prosp., 1, 630559 Kol’tsovo, RussiaSynchrotron Radiation Facility SKIF, Nikolsky Prosp., 1, 630559 Kol’tsovo, RussiaIn this work, the origin of the synergetic effect in mixed Mn<sub>x</sub>Co<sub>3-x</sub>O<sub>4</sub> oxides with the spinel structure in the CO oxidation reaction was tested. A series of Mn<sub>x</sub>Co<sub>3-x</sub> oxide catalysts were synthesized by the coprecipitation method with further calcination at 600 °C and varying manganese content from x = 0 to x = 3. The catalysts were characterized using XRD, TEM, N<sub>2</sub> adsorption, TPR, EXAFS, and XPS. The catalytic activity of Mn<sub>x</sub>Co<sub>3-x</sub> oxide catalysts was tested in CO oxidation reactions. The addition of manganese to cobalt oxide results in the formation of mixed Mn-Co oxides based on a cubic or tetragonal spinel structure, a change in microstructural properties, such as surface area and crystal size, as well as local distortions and a decrease in the surface concentration of Co ions and Co in the octahedral sites in spinel structure; it also decreases catalyst reducibility. For all catalysts, the activity of CO oxidation decreases as follows: Mn<sub>0.1</sub>Co<sub>2.9</sub> > Co<sub>3</sub>O<sub>4</sub>~Mn<sub>0.3</sub>Co<sub>2.7</sub> > Mn<sub>0.5</sub>Co<sub>2.5</sub> > MnO<sub>x</sub> > Mn<sub>0.7</sub>Co<sub>2.3</sub> > Mn<sub>0.9</sub>Co<sub>2.1</sub>~Mn<sub>1.1</sub>Co<sub>1.9</sub>~Mn<sub>2.5</sub>Co<sub>0.5</sub> > Mn<sub>2.9</sub>Co<sub>0.1</sub> > Mn<sub>1.7</sub>Co<sub>1.3</sub> > Mn<sub>2.1</sub>Co<sub>0.9</sub> > Mn<sub>1.3</sub>Co<sub>1.7</sub>~Mn<sub>1.5</sub>Co<sub>1.5</sub>~Mn<sub>2.3</sub>Co<sub>0.7</sub>. The Mn<sub>0.1</sub>Co<sub>2.9</sub> catalyst displays the best catalytic activity, which is attributed to its small crystal size and the maximum surface ratio between Co<sup>3+</sup> and Co<sup>2+</sup>. A further increase in the manganese content (x > 0.3) provokes drastic changes in the catalytic properties due to a decrease in the cobalt content on the surface and in the volume of mixed oxide, changes in the oxidation states of cations, and structure transformation.https://www.mdpi.com/2304-6740/13/1/8Mn<sub>x</sub>Co<sub>3-x</sub>O<sub>4</sub> oxidessolid solutionssynergetic effectCO oxidation |
| spellingShingle | Olga A. Bulavchenko Vladimir A. Rogov Evgeny Yu. Gerasimov Egor E. Aydakov Anna M. Kremneva The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO Inorganics Mn<sub>x</sub>Co<sub>3-x</sub>O<sub>4</sub> oxides solid solutions synergetic effect CO oxidation |
| title | The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO |
| title_full | The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO |
| title_fullStr | The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO |
| title_full_unstemmed | The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO |
| title_short | The Origin of Synergetic Effect in Mixed Mn-Co Oxide with Spinel Structure for Catalytic Oxidation of CO |
| title_sort | origin of synergetic effect in mixed mn co oxide with spinel structure for catalytic oxidation of co |
| topic | Mn<sub>x</sub>Co<sub>3-x</sub>O<sub>4</sub> oxides solid solutions synergetic effect CO oxidation |
| url | https://www.mdpi.com/2304-6740/13/1/8 |
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